Etymology
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perfidious (adj.)

"faithless, basely treacherous," 1590s, from Latin perfidiosus "treacherous," from perfidia "faithlessness" (see perfidy). Related: Perfidiously; perfidiousness.

The treacherous man either betrays the confidence that is reposed in him, or lures another on to harm by deceitful appearances; as, the treacherous signals of the wrecker. The perfidious man carries treachery to the basest extreme: he betrays acknowledged and accepted obligations, and even the most sacred relationships and claims: as, Benedict Arnold and Judas are types of perfidy. [Century Dictionary, 1895]

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Definitions of perfidious

perfidious (adj.)
tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans;
the perfidious Judas
Synonyms: punic / treacherous
From wordnet.princeton.edu